"It is extremely easy in the United States to obtain guns, to find places to practice using them, and to find trainers willing to teach you to use them. There’s no need to have any contact with the U.S. military in order to dress and act as if you’re in the military, as many mass-shooters do, some of them waging their own delusional wars against immigrants or other groups. But it is remarkable that at least 36% of U.S. mass shooters (and quite possibly more) have in fact been trained by the U.S. military."